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2012 dd15 low tone knocking at 1400-1500 rpm under load. Pdf deleted, getting better when engine at

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Reedbooks, Dec 9, 2019.

  1. Dec 9, 2019 #1
    Reedbooks

    Reedbooks Bobtail Member

    2
    0
    Sep 18, 2012
    0
    Hear knocking at14-1500 rpm. Under load.
    When engine at normal operating temp sound better. Also a little vibration at 1500 rpm. Oil pressure good, no smoking no oil consumption. Any ideas?
     
    Reedbooks, Dec 9, 2019
    Reedbooks, Dec 9, 2019
    #1
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  3. Dec 9, 2019 #2
    PE_T

    PE_T Road Train Member

    3,412
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    Jul 12, 2017
    Texas (trucking since 02/2013)
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    Did the knocking start right after the deletion? My truck (with DPF) made knocking noises when the fuel injectors went out, but in my case the knocking was when trying to start the engine, and I was not able to start the engine.
     
    PE_T, Dec 9, 2019
    PE_T, Dec 9, 2019
    #2
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